Magnetic structure and magnetocalorics of GdPO4
Resumen: The magnetic ordering structure of GdPO4 is determined at T=60 mK by the diffraction of hot neutrons with wavelength ¿=0.4696 Å. It corresponds to a noncollinear antiferromagnetic arrangement of the Gd moments with propagation vector k=(1/2,0,1/2). This arrangement is found to minimize the dipole-dipole interaction and the crystal-field anisotropy energy, the magnetic superexchange being much smaller. The intensity of the magnetic reflections decreases with increasing temperature and vanishes at T˜0.8 K, in agreement with the magnetic ordering temperature TN=0.77 K, as reported in previous works based on heat capacity and magnetic susceptibility measurements. The magnetocaloric parameters have been determined from heat capacity data at constant applied fields up to 7 T, as well as from isothermal magnetization data. The magnetocaloric effect, for a field change ¿B=0-7T, reaches -¿ST=375.8mJ/cm3K-1 at T=2.1 K, largely exceeding the maximum values reported to date for Gd-based magnetic refrigerants.
Idioma: Inglés
DOI: 10.1103/PhysRevB.90.214423
Año: 2014
Publicado en: Physical Review B. Condensed Matter and Materials Physics 90, 21 (2014), 214423 [9 pp]
ISSN: 1098-0121

Factor impacto JCR: 3.736 (2014)
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 14 / 66 = 0.212 (2014) - Q1 - T1
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2012-38318-C03-01
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-R
Tipo y forma: Article (Published version)
Área (Departamento): Física de la Materia Condensada (Departamento de Física de la Materia Condensada)

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